Maybe to be with his wife and son?
I normally don’t count that against anyone but a little flexibility would go a long way when you arrive back in New York after 1 a.m. Friday morning rather than staying overnight after a rally in New Hampshire the night before and the rest of your team ends up stranded between LaGuardia and the FBO in Manchester, N.H. Just ditch the plane and stay on the ground listening to voters (will still vote for him, though. :))